Add ability to bail out from custom call generators to x64 and ARM platforms.

src/arm/stub-cache-arm.cc

Index: src/arm/stub-cache-arm.cc
diff --git a/src/arm/stub-cache-arm.cc b/src/arm/stub-cache-arm.cc
index aec937d626f4b991e8848e2f563980ea1faabc58..e182bede76f39499a963be6dfa2b0299a3ae86da 100644
--- a/src/arm/stub-cache-arm.cc
+++ b/src/arm/stub-cache-arm.cc
@@ -837,6 +837,11 @@ Object* CallStubCompiler::CompileArrayPushCall(Object* object,
   //  -- lr    : return address
   // -----------------------------------
 
+  // If object is not an array, bail out to regular call.
+  if (!object->IsJSArray()) {
+    return Heap::undefined_value();
+  }
+
   // TODO(639): faster implementation.
   ASSERT(check == RECEIVER_MAP_CHECK);
 
@@ -886,6 +891,11 @@ Object* CallStubCompiler::CompileArrayPopCall(Object* object,
   //  -- lr    : return address
   // -----------------------------------
 
+  // If object is not an array, bail out to regular call.
+  if (!object->IsJSArray()) {
+    return Heap::undefined_value();
+  }
+
   // TODO(642): faster implementation.
   ASSERT(check == RECEIVER_MAP_CHECK);
 
@@ -938,7 +948,11 @@ Object* CallStubCompiler::CompileCallConstant(Object* object,
   if (function_info->HasCustomCallGenerator()) {
     CustomCallGenerator generator =
         ToCData<CustomCallGenerator>(function_info->function_data());
-    return generator(this, object, holder, function, name, check);
+    Object* result = generator(this, object, holder, function, name, check);
+    // undefined means bail out to regular compiler.
+    if (!result->IsUndefined()) {
+      return result;
+    }
   }
 
   Label miss;